January 12 » The National Trust is founded in the United Kingdom.
April 6 » Oscar Wilde is arrested in the Cadogan Hotel, London, after losing a libel case against the Marquess of Queensberry.
May 25 » The Republic of Formosa is formed, with Tang Jingsong as its president.
June 20 » The Kiel Canal, crossing the base of the Jutland peninsula and the busiest artificial waterway in the world, is officially opened.
November 8 » While experimenting with electricity, Wilhelm Röntgen discovers the X-ray.
November 28 » The first American automobile race takes place over the 54 miles from Chicago's Jackson Park to Evanston, Illinois. Frank Duryea wins in approximately 10 hours.
Day of marriage June 30, 1923
The temperature on June 30, 1923 was between 9.5 °C and 19.0 °C and averaged 13.2 °C. There was 1.0 hours of sunshine (6%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
August 18 » First British Track and Field championships for women, London.
September 13 » Following a military coup in Spain, Miguel Primo de Rivera takes over, setting up a dictatorship.
September 26 » The German government accepts the occupation of the Ruhr.
September 29 » The First American Track & Field championships for women are held.
October 29 » Turkey becomes a republic following the dissolution of the Ottoman Empire.
November 11 » Adolf Hitler was arrested in Munich for high treason for his role in the Beer Hall Putsch.
Day of death February 14, 1968
The temperature on February 14, 1968 was between 0.9 °C and 5.0 °C and averaged 2.4 °C. There was 1.2 mm of rain during 3.3 hours. The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 22 » Apollo 5 lifts off carrying the first Lunar module into space.
January 30 » Vietnam War: Tet Offensive launch by forces of the Viet Cong and North Vietnamese Army against South Vietnam, the United States, and their allies.
January 31 » Vietnam War: Viet Cong guerrillas attack the United States embassy in Saigon, and other attacks, in the early morning hours, later grouped together as the Tet Offensive.
July 26 » Vietnam War: South Vietnamese opposition leader Trương Đình Dzu is sentenced to five years hard labor for advocating the formation of a coalition government as a way to move toward an end to the war.
November 11 » Vietnam War: Operation Commando Hunt initiated. The goal is to interdict men and supplies on the Ho Chi Minh trail, through Laos into South Vietnam.
December 23 » The 82 sailors from the USSPueblo are released after eleven months of internment in North Korea.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I2793.php : accessed February 19, 2026), "Pieter Kleijn (1895-1968)".
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